Attributes & Filters


Attributes and Filters

We use OpendTect and plugins in our service work to enhance seismic data and to extract and interpret seismic attributes. Our service work in this field includes among others: cleaning up seismic data by removing noise, sharpening faults, detecting fractures, increasing the vertical seismic resolution, enhancing subtle hydrocarbon anomalies, creating and analyzing AvO attributes and interpreting seismic patterns and objects.

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Services

dGB conducts exclusive, tailor made studies on behalf of international E&P companies and National Oil Companies. Studies typically involve integration of geological knowledge, well data and seismic data, for which we use OpendTect as well as 3rd party software products. The study objectives may vary from regional exploration (object detection, fluid migration history, sequence stratigraphy) to qualitative and quantitative interpretations to support understanding of reservoir distributions and properties.

OpendTect Plugins

Attribute analysis requires a geologic mind and a system that supports multi-volume, interactive analysis. That is what OpendTect is all about! You zoom in on your target. You calculate attributes on-the-fly. You test attribute parameters in movie-style fashion. You calculate attributes from attributes. You create your own attributes and filters using math and logic. In other words: the total number of attributes in OpendTect is unlimited. This gives you total freedom to use your full expertise. The commercial plugins to OpendTect give you even more power:

Seismic Attributes

Dip-Steering

Dip-Steering

Dip-Steering is used to improve multi-trace attributes by extracting attribute inputs along reflectors (e.g. dip-steered similarity) and to calculate unique attributes, such as dip & azimuth, volume-curvature, and variance of the dip.

Read more about the Dip Steering plugin

Neural Networks

Neural Networks

Neural Networks are used to combine multiple attributes into meta-attributes for object detection such as chimneys or faults. Neural networks are also used for pattern recognition for seismic facies volumes and horizon-based waveform segmentation. Another application of Neural Networks is the inversion to porosity, Vshale, Sw along well tracks.

Read more about the Neural network plugin

Fluid Contact Finder (formerly CCB)

Fluid Contact Finder

Fluid Contact Finder (formerly CCB) stacks seismic traces along horizon contour lines to highlight subtle hydrocarbon-related seismic anomalies and to accurately pin-point gas-water, gas-oil and oil-water contacts.

Read more about the FCF plugin

Seismic Filters

SSB

Seismic Spectral Blueing

SSB (Seismic Spectral Blueing) plugin is a technique to optimize the vertical resolution of seismic data by shaping the seismic spectrum without boosting noise.

Read more about the SSB plugin

Dip-Steering

Dip-Steering

Dip-steering is also used for structurally-oriented filters to remove random noise (e.g. dip-steered median filter) and/or to sharpen fault edges (e.g. Fault
Enhancement Filter)

Read more about the Dip-Steering plugin

Processing

For our R&D software users and users who occasionally require certain processing capabilities we created a job-deck builder for Madagascar, the Open Source processing system that is widely used in Academic circles. The Madagascar link supports IO to and from both packages ensuring a seamless integration.


Madagascar

Madagascar

OpendTect features a connection to Madagascar, the Open Source seismic processing package. The
processing flow builder of OpendTect enables the user to construct and execute Madagascar processing jobs. Processing flows can start from 2D and 3D pre- and post-stack data in either Madagascar or OpendTect format. Likewise results can be saved in both formats. Data stored in OpendTect format can be further analyzed in OpendTect.

Read more about Madagascar

Velocity Model Building

Velocity Model Building

The VMB plugin is used for picking RMO velocities from pre-stack Common Image Gathers. RMO velocities are used to update the (3D) velocity model in PSDM work flows. VMB supports picking on semblance gathers and picking of pre-stack events for input to PSDM. Two VMB modules are supported: vertical update and horizon-consistent update. The actual creation of velocity models is performed in OpendTect Base. Models are constructed from combinations of gridded / smoothed RMO velocities, interval velocities and 3D body velocities. VMB is designed to support multiple PSDM systems. All structures needed to interface a PSDM system to OpendTect VMB are released in the Open Source domain.

Read more about the Velocity Model Building plugin